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contiki/core/net/packetbuf.h

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/**
* \addtogroup rime
* @{
*/
/**
* \defgroup packetbuf Rime buffer management
* @{
*
* The packetbuf module does Rime's buffer management.
*/
/*
* Copyright (c) 2006, 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. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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 Contiki operating system.
*
* $Id: packetbuf.h,v 1.1 2010/06/14 19:19:16 adamdunkels Exp $
*/
/**
* \file
* Header file for the Rime buffer (packetbuf) management
* \author
* Adam Dunkels <adam@sics.se>
*/
#ifndef __PACKETBUF_H__
#define __PACKETBUF_H__
#include "contiki-conf.h"
#include "net/rime/rimeaddr.h"
/**
* \brief The size of the packetbuf, in bytes
*/
#ifdef PACKETBUF_CONF_SIZE
#define PACKETBUF_SIZE PACKETBUF_CONF_SIZE
#else
#define PACKETBUF_SIZE 128
#endif
/**
* \brief The size of the packetbuf header, in bytes
*/
#ifdef PACKETBUF_CONF_HDR_SIZE
#define PACKETBUF_HDR_SIZE PACKETBUF_CONF_HDR_SIZE
#else
#define PACKETBUF_HDR_SIZE 48
#endif
/**
* \brief Clear and reset the packetbuf
*
* This function clears the packetbuf and resets all
* internal state pointers (header size, header pointer,
* external data pointer). It is used before preparing a
* packet in the packetbuf.
*
*/
void packetbuf_clear(void);
/**
* \brief Clear and reset the header of the packetbuf
*
* This function clears the header of the packetbuf and
* resets all the internal state pointers pertaining to
* the header (header size, header pointer, but not
* external data pointer). It is used before after sending
* a packet in the packetbuf, to be able to reuse the
* packet buffer for a later retransmission.
*
*/
void packetbuf_clear_hdr(void);
void packetbuf_hdr_remove(int bytes);
/**
* \brief Get a pointer to the data in the packetbuf
* \return Pointer to the packetbuf data
*
* This function is used to get a pointer to the data in
* the packetbuf. The data is either stored in the packetbuf,
* or referenced to an external location.
*
* For outbound packets, the packetbuf consists of two
* parts: header and data. The header is accessed with the
* packetbuf_hdrptr() function.
*
* For incoming packets, both the packet header and the
* packet data is stored in the data portion of the
* packetbuf. Thus this function is used to get a pointer to
* the header for incoming packets.
*
*/
void *packetbuf_dataptr(void);
/**
* \brief Get a pointer to the header in the packetbuf, for outbound packets
* \return Pointer to the packetbuf header
*
* For outbound packets, the packetbuf consists of two
* parts: header and data. This function is used to get a
* pointer to the header in the packetbuf. The header is
* stored in the packetbuf.
*
*/
void *packetbuf_hdrptr(void);
/**
* \brief Get the length of the header in the packetbuf, for outbound packets
* \return Length of the header in the packetbuf
*
* For outbound packets, the packetbuf consists of two
* parts: header and data. This function is used to get
* the length of the header in the packetbuf. The header is
* stored in the packetbuf and accessed via the
* packetbuf_hdrptr() function.
*
*/
uint8_t packetbuf_hdrlen(void);
/**
* \brief Get the length of the data in the packetbuf
* \return Length of the data in the packetbuf
*
* For outbound packets, the packetbuf consists of two
* parts: header and data. This function is used to get
* the length of the data in the packetbuf. The data is
* stored in the packetbuf and accessed via the
* packetbuf_dataptr() function.
*
* For incoming packets, both the packet header and the
* packet data is stored in the data portion of the
* packetbuf. This function is then used to get the total
* length of the packet - both header and data.
*
*/
uint16_t packetbuf_datalen(void);
/**
* \brief Get the total length of the header and data in the packetbuf
* \return Length of data and header in the packetbuf
*
*/
uint16_t packetbuf_totlen(void);
/**
* \brief Set the length of the data in the packetbuf
* \param len The length of the data
*
* For outbound packets, the packetbuf consists of two
* parts: header and data. This function is used to set
* the length of the data in the packetbuf.
*/
void packetbuf_set_datalen(uint16_t len);
/**
* \brief Point the packetbuf to external data
* \param ptr A pointer to the external data
* \param len The length of the external data
*
* For outbound packets, the packetbuf consists of two
* parts: header and data. This function is used to make
* the packetbuf point to external data. The function also
* specifies the length of the external data that the
* packetbuf references.
*/
void packetbuf_reference(void *ptr, uint16_t len);
/**
* \brief Check if the packetbuf references external data
* \retval Non-zero if the packetbuf references external data, zero otherwise.
*
* For outbound packets, the packetbuf consists of two
* parts: header and data. This function is used to check
* if the packetbuf points to external data that has
* previously been referenced with packetbuf_reference().
*
*/
int packetbuf_is_reference(void);
/**
* \brief Get a pointer to external data referenced by the packetbuf
* \retval A pointer to the external data
*
* For outbound packets, the packetbuf consists of two
* parts: header and data. The data may point to external
* data that has previously been referenced with
* packetbuf_reference(). This function is used to get a
* pointer to the external data.
*
*/
void *packetbuf_reference_ptr(void);
/**
* \brief Compact the packetbuf
*
* This function compacts the packetbuf by copying the data
* portion of the packetbuf so that becomes consecutive to
* the header. It also copies external data that has
* previously been referenced with packetbuf_reference()
* into the packetbuf.
*
* This function is called by the Rime code before a
* packet is to be sent by a device driver. This assures
* that the entire packet is consecutive in memory.
*
*/
void packetbuf_compact(void);
/**
* \brief Copy from external data into the packetbuf
* \param from A pointer to the data from which to copy
* \param len The size of the data to copy
* \retval The number of bytes that was copied into the packetbuf
*
* This function copies data from a pointer into the
* packetbuf. If the data that is to be copied is larger
* than the packetbuf, only the data that fits in the
* packetbuf is copied. The number of bytes that could be
* copied into the rimbuf is returned.
*
*/
int packetbuf_copyfrom(const void *from, uint16_t len);
/**
* \brief Copy the entire packetbuf to an external buffer
* \param to A pointer to the buffer to which the data is to be copied
* \retval The number of bytes that was copied to the external buffer
*
* This function copies the packetbuf to an external
* buffer. Both the data portion and the header portion of
* the packetbuf is copied. If the packetbuf referenced
* external data (referenced with packetbuf_reference()) the
* external data is copied.
*
* The external buffer to which the packetbuf is to be
* copied must be able to accomodate at least
* (PACKETBUF_SIZE + PACKETBUF_HDR_SIZE) bytes. The number of
* bytes that was copied to the external buffer is
* returned.
*
*/
int packetbuf_copyto(void *to);
/**
* \brief Copy the header portion of the packetbuf to an external buffer
* \param to A pointer to the buffer to which the data is to be copied
* \retval The number of bytes that was copied to the external buffer
*
* This function copies the header portion of the packetbuf
* to an external buffer.
*
* The external buffer to which the packetbuf is to be
* copied must be able to accomodate at least
* PACKETBUF_HDR_SIZE bytes. The number of bytes that was
* copied to the external buffer is returned.
*
*/
int packetbuf_copyto_hdr(uint8_t *to);
/**
* \brief Extend the header of the packetbuf, for outbound packets
* \param size The number of bytes the header should be extended
* \retval Non-zero if the header could be extended, zero otherwise
*
* This function is used to allocate extra space in the
* header portion in the packetbuf, when preparing outbound
* packets for transmission. If the function is unable to
* allocate sufficient header space, the function returns
* zero and does not allocate anything.
*
*/
int packetbuf_hdralloc(int size);
/**
* \brief Reduce the header in the packetbuf, for incoming packets
* \param size The number of bytes the header should be reduced
* \retval Non-zero if the header could be reduced, zero otherwise
*
* This function is used to remove the first part of the
* header in the packetbuf, when processing incoming
* packets. If the function is unable to remove the
* requested amount of header space, the function returns
* zero and does not allocate anything.
*
*/
int packetbuf_hdrreduce(int size);
/* Packet attributes stuff below: */
typedef uint16_t packetbuf_attr_t;
struct packetbuf_attr {
/* uint8_t type; */
packetbuf_attr_t val;
};
struct packetbuf_addr {
/* uint8_t type; */
rimeaddr_t addr;
};
#define PACKETBUF_ATTR_PACKET_TYPE_DATA 0
#define PACKETBUF_ATTR_PACKET_TYPE_ACK 1
#define PACKETBUF_ATTR_PACKET_TYPE_STREAM 2
enum {
PACKETBUF_ATTR_NONE,
/* Scope 0 attributes: used only on the local node. */
PACKETBUF_ATTR_CHANNEL,
PACKETBUF_ATTR_NETWORK_ID,
PACKETBUF_ATTR_LINK_QUALITY,
PACKETBUF_ATTR_RSSI,
PACKETBUF_ATTR_TIMESTAMP,
PACKETBUF_ATTR_RADIO_TXPOWER,
PACKETBUF_ATTR_LISTEN_TIME,
PACKETBUF_ATTR_TRANSMIT_TIME,
PACKETBUF_ATTR_MAX_MAC_TRANSMISSIONS,
PACKETBUF_ATTR_MAC_SEQNO,
PACKETBUF_ATTR_MAC_ACK,
/* Scope 1 attributes: used between two neighbors only. */
PACKETBUF_ATTR_RELIABLE,
PACKETBUF_ATTR_PACKET_ID,
PACKETBUF_ATTR_PACKET_TYPE,
PACKETBUF_ATTR_REXMIT,
PACKETBUF_ATTR_MAX_REXMIT,
PACKETBUF_ATTR_NUM_REXMIT,
PACKETBUF_ATTR_PENDING,
/* Scope 2 attributes: used between end-to-end nodes. */
PACKETBUF_ATTR_HOPS,
PACKETBUF_ATTR_TTL,
PACKETBUF_ATTR_EPACKET_ID,
PACKETBUF_ATTR_EPACKET_TYPE,
PACKETBUF_ATTR_ERELIABLE,
/* These must be last */
PACKETBUF_ADDR_SENDER,
PACKETBUF_ADDR_RECEIVER,
PACKETBUF_ADDR_ESENDER,
PACKETBUF_ADDR_ERECEIVER,
PACKETBUF_ATTR_MAX
};
#define PACKETBUF_NUM_ADDRS 4
#define PACKETBUF_NUM_ATTRS (PACKETBUF_ATTR_MAX - PACKETBUF_NUM_ADDRS)
#define PACKETBUF_ADDR_FIRST PACKETBUF_ADDR_SENDER
#define PACKETBUF_IS_ADDR(type) ((type) >= PACKETBUF_ADDR_FIRST)
#if PACKETBUF_CONF_ATTRS_INLINE
extern struct packetbuf_attr packetbuf_attrs[];
extern struct packetbuf_addr packetbuf_addrs[];
static int packetbuf_set_attr(uint8_t type, const packetbuf_attr_t val);
static packetbuf_attr_t packetbuf_attr(uint8_t type);
static int packetbuf_set_addr(uint8_t type, const rimeaddr_t *addr);
static const rimeaddr_t *packetbuf_addr(uint8_t type);
static inline int
packetbuf_set_attr(uint8_t type, const packetbuf_attr_t val)
{
/* packetbuf_attrs[type].type = type; */
packetbuf_attrs[type].val = val;
return 1;
}
static inline packetbuf_attr_t
packetbuf_attr(uint8_t type)
{
return packetbuf_attrs[type].val;
}
static inline int
packetbuf_set_addr(uint8_t type, const rimeaddr_t *addr)
{
/* packetbuf_addrs[type - PACKETBUF_ADDR_FIRST].type = type; */
rimeaddr_copy(&packetbuf_addrs[type - PACKETBUF_ADDR_FIRST].addr, addr);
return 1;
}
static inline const rimeaddr_t *
packetbuf_addr(uint8_t type)
{
return &packetbuf_addrs[type - PACKETBUF_ADDR_FIRST].addr;
}
#else /* PACKETBUF_CONF_ATTRS_INLINE */
int packetbuf_set_attr(uint8_t type, const packetbuf_attr_t val);
packetbuf_attr_t packetbuf_attr(uint8_t type);
int packetbuf_set_addr(uint8_t type, const rimeaddr_t *addr);
const rimeaddr_t *packetbuf_addr(uint8_t type);
#endif /* PACKETBUF_CONF_ATTRS_INLINE */
void packetbuf_attr_clear(void);
void packetbuf_attr_copyto(struct packetbuf_attr *attrs,
struct packetbuf_addr *addrs);
void packetbuf_attr_copyfrom(struct packetbuf_attr *attrs,
struct packetbuf_addr *addrs);
#define PACKETBUF_ATTRIBUTES(...) { __VA_ARGS__ PACKETBUF_ATTR_LAST }
#define PACKETBUF_ATTR_LAST { PACKETBUF_ATTR_NONE, 0 }
#define PACKETBUF_ATTR_BIT 1
#define PACKETBUF_ATTR_BYTE 8
#define PACKETBUF_ADDRSIZE (sizeof(rimeaddr_t) * PACKETBUF_ATTR_BYTE)
struct packetbuf_attrlist {
uint8_t type;
uint8_t len;
};
#endif /* __PACKETBUF_H__ */
/** @} */
/** @} */
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